If you have a switched power source (power off with ignition off), that is easy to accomplish. Build a profile that senses both a car dock event and no power event. Add a task that alarms the tune of your choice.

If your power source is not switched -- much more difficult. You would need to monitor for location change and alert if docked and the car is still beyond your preferred threshold. I suspect that would be highly annoying at stoplights, etc.

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